Binders are the tobacco leaf that actually holds the cigar together. Once the filler is folded according to its blend, then the binder is applied and the cigar is rolled. Then the cigar is placed in molds until ready for the application of the wrapper.
Almost any place where cigar filler or wrapper is grown, binders are also harvested as often the thicker tops of the tobacco plant is used for this purpose. The better binders come from Cuba, Connecticut, Mexico, and Ecuador today although Java and Sumatra binders are highly prized for there durability and flexibility.